大渡河流域时序InSAR地质灾害监测

大渡河流域滑坡灾害频发，对流域内的施工建设和水电站安全造成极大威胁，获取流域地灾分布一张图对防灾减灾工作具有重要意义。本研究基于时间序列InSAR技术，对覆盖了大渡河丹巴至乐山段的升轨Sentinel-1数据进行分析，获取了流域2018-2021年的大范围形变结果，并结合光学影像识别出潜在的隐患区域。研究结果表明：区域最大形变速率达到了-65.2 mm /y；大部分沉降区集中在丹巴、石棉和汉源地区，主要受到地质构造活动和降雨等因素驱动；综合考虑形变速率、地形、植被覆盖和变形范围的影响，在大渡河沿线发现了15处较显著的滑坡隐患区；在典型形变区域，InSAR结果与地面测量数据基本一致，证明了InSAR滑坡监测技术在复杂西南山区的有效性，测量结果将为当地灾害治理提供指导依据。

Geohazard monitoring and analysis in Dadu river basin based on time series InSAR

The frequent geohazards happened in Dadu River basin has greatly threatened the safety of the infrastructure construction and hydropower stations, thus it is of great significance to obtain a geohazard map of Dadu River for the disaster prevention and mitigation. The ascending Sentinel-1A dataset acquired by 2017~2021 were collected to conduct deformation monitoring for regions from Danba to Leshan Section along the Dadu River, based on time series InSAR technique. And through the analysis of InSAR deformation results and optical images, the hidden landslide pots were detected along the Dadu River. The results show that the maximum deformation rate in the study region has reached -65.2 mm/year. Most of the deforming regions are located in the Danba, Shimian and Hanyuan, which are closely related to the geological activity and climate. With the consideration of deformation rate, topography, vegetation cover and deformation areas, totally 15 obvious landslide regions have been identified. InSAR deformation results in the typical region has shown well agreement with the geodetical measurements, which can prove the effectiveness of InSAR large-scale landslide monitoring in the complex regions of Southwestern China. The deformation results in this work will provide important guidance for geohazard control and prevention for the local government.